diff --git a/src/transport.rs b/src/transport.rs
index ee1f3ef97b..abd9045eb0 100644
--- a/src/transport.rs
+++ b/src/transport.rs
@@ -347,7 +347,7 @@ unsafe fn set_err_io(e: &io::Error) {
 }
 
 unsafe fn set_err(e: &Error) {
-    let s = CString::new(e.to_string()).unwrap();
+    let s = CString::new(e.message())).unwrap();
     raw::git_error_set_str(e.raw_class() as c_int, s.as_ptr());
 }